diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 415f0dc8..fad6d75f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,6 +13,7 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
+        extensions: [mbstring, intl, gd, xsl, gmp, bcmath] 
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
     - name: Checkout